Avoiding useless talk and activites

Everything which is of no use in this world or in the next is useless and its avoidance has been enjoined  in Qur'an as well as hadith:

والذین هم عن الغوي معرضون

الایه

nor one who avoid shun useless conversation

Abu Hurairah has related that our Holy Prophet has said:

من حسن اسلام المرء ترکه مالایعنیه

 (Tirmidhi ).

A part of being a good Muslim is avoiding useless things.

Hence it is the duty of every Muslim to avoid useless works and activities

source: Easy good deeds